HEART RIVER BASIN

                                   06345780 HEART RIVER ABOVE LAKE TSCHIDA NEAR GLEN ULLIN, ND

LOCATION.--Lat 4639'24", Long 10204'40", in SW1/4NE1/4NE1/4 sec.30, T.137 N., R.90 W., Grant County, Hydrologic Unit 10130202,
   on right bank 100 ft downstream from bridge on county road, and 16 mi south and 1 mi west of Hebron.

DRAINAGE AREA.--1,530 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--July 1988 to current year.

GAGE.--Water-stage recorder. Datum of gage is 2,090 ft above sea level, from topographic map.

REMARKS.--Records good. Flow is regulated by E.A. Patterson Lake (station 06343500) about 90 river mi upstream from station, and
   some diversions for irrigation and water supply at low flow.

                          DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
                                                       DAILY MEAN VALUES

        DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

          1        21       30      e21       35       14      142       36       37       19       17     13      11
          2        21       29      e20       32       14      195       38       34       23       15     13      13
          3        21       28      e20       29       17      189       39       33       23       13     12      12
          4        21       30      e20       26       20      162       40       31       24       12      9.6    10
          5        21       29      e20       27       20      148       40       31       25       11     15      10

          6        22       29      e20       24       20      145       38       28       30       18     13      11
          7        24       30      e19       23       21      133       38       31       40       23     13       7.7
          8        23       30      e19       24       21      123       38       43       40       38    e13       5.6
          9        23       30      e19      e23       23      131       36       59       32       46    e13       4.2
         10        24       31      e19      e22       22       80       35       60       25       40    e12       2.6

         11        23       30      e19      e21       23       75       33       73       20       42     12       2.2
         12        24       31      e19      e21       20       77       32       69       16       39     11       1.7
         13        26       33      e19       21       19      e70       31       61       23       46     10       1.4
         14        30       32      e18       20       19      e60       33       54       29       52     13       1.1
         15        29       32      e18       19       17      e55       33       49       32       53     10        .92

         16        28       33      e18       18       17      e51       34       45       38       40      8.2      .85
         17        28       28      e18       20       17      e56       36       41       44       35      8.7      .85
         18        30       24      e18       17       18      e58       39       37       52       41      8.3      .75
         19        32       23      e18       17       18      e52       42       34       51       40      7.4      .67
         20        33       24      e17       17       18      e60       43       34       49       39      8.3      .64

         21        30       24      e17       18       19      e55       42       32       40       38      9.7     1.3
         22        28      e23      e17       18       20      e55      e39       28       38       46      9.6     3.0
         23        27      e23      e18       17       25      e51      e35       24       34       35      9.7     3.5
         24        28      e23       18       16       37      e50      e38       21       31       29      9.9     3.3
         25        28      e23       18       15       63      e48      e42       20       26       24     10       3.3

         26        27      e22       21       15       90      e51      e45       19       22       21     15       3.8
         27        27      e22       26       15      103      e50      e44       18       19       21     19       4.4
         28        26      e22       34       15      150      e48       43       17       17       20     18       5.4
         29        26      e21       35       16      122      e44       41       17       19       20     16      10
         30        29      e21       36       15      ---      e40       40       17       20       18     12      10
         31        32      ---       36       14      ---       37      ---       16      ---       16     12        ---

        TOTAL     812      810      655      630     1007     2591     1143     1113      901      948    364.4   146.18
        MEAN     26.2     27.0     21.1     20.3     34.7     83.6     38.1     35.9     30.0     30.6     11.8     4.87
        MAX        33       33       36       35      150      195       45       73       52       53       19       13
        MIN        21       21       17       14       14       37       31       16       16       11      7.4      .64
        AC-FT    1610     1610     1300     1250     2000     5140     2270     2210     1790     1880      723      290

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1988 - 2000, BY WATER YEAR (WY)

        MEAN     23.1     21.4     14.7     9.98     46.1      324      131     90.4     87.3     72.3     52.1     12.2
        MAX       104     95.3     57.7     25.2      205     1587      582      391      279      265      252     44.2
        (WY)     1999     1999     1999     1996     1996     1997     1997     1995     1998     1993     1995     1995
        MIN      2.23     6.52     4.14      .32     3.41     18.5     9.90     6.20     7.21     3.16     .050      .10
        (WY)     1992     1991     1993     1991     1989     1990     1992     1992     1992     1989     1991     1991

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1988 - 2000

        ANNUAL TOTAL                       58505                      11120.58
        ANNUAL MEAN                          160                         30.4                       75.0
        HIGHEST ANNUAL MEAN                                                                        229              1997
        LOWEST ANNUAL MEAN                                                                           9.17           1992
        HIGHEST DAILY MEAN                  3800     Mar  2             195     Mar  2           11000       Mar 22 1997
        LOWEST DAILY MEAN                     10     Aug  1                .64  Sep 20                .00    Sep  1 1991
        ANNUAL SEVEN-DAY MINIMUM              11     Jul 30                .83  Sep 14                .00    Aug 30 1991
        INSTANTANEOUS PEAK FLOW                                         217     Mar  3         a 11500       Mar 22 1997
        INSTANTANEOUS PEAK STAGE                                          6.07  Mar  3            b 26.74    Mar 21 1997
        ANNUAL RUNOFF (AC-FT)             116000                      22060                      54300
        10 PERCENT EXCEEDS                   349                         51                        119
        50 PERCENT EXCEEDS                    33                         23                         17
        90 PERCENT EXCEEDS                    18                         10                          2.0

        a  About
        b  Backwater from ice
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 1988 to current year.

REMARKS.--Quality assurance sample also collected at this location.

                                 WATER-QUALITY DATA, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000

                                DIS-     PH       PH       SPE-
                              CHARGE,   WATER    WATER    CIFIC    SPE-                       HARD-             MAGNE-
                               INST.    WHOLE    WHOLE     CON-    CIFIC                      NESS    CALCIUM    SIUM,
                               CUBIC    FIELD     LAB     DUCT-    CON-    TEMPER-  TEMPER-   TOTAL    DIS-      DIS-
                                FEET   (STAND-  (STAND-   ANCE     DUCT-    ATURE    ATURE    (MG/L    SOLVED   SOLVED
             DATE      TIME     PER      ARD      ARD      LAB     ANCE      AIR     WATER     AS      (MG/L    (MG/L
                               SECOND   UNITS)   UNITS)  (US/CM)  (US/CM)  (DEG C)  (DEG C)   CACO3)   AS CA)   AS MG)
                              (00061)  (00400)  (00403)  (90095)  (00095)  (00020)  (00010)  (00900)  (00915)  (00925)

         OCT
           06...       1030     20        --       --       --     1980      8.0      7.0       --       --       --
         NOV
           15...       1125     33        --       --       --     2210     15.0      5.0       --       --       --
         JAN
           14...       1350     18        --       --       --     2720       .5       .2       --       --       --
         FEB
           14...       1235     21        --       --       --     2380     -1.0       .1       --       --       --
         MAR
           13...       1250     67        --       --       --     1710      9.0       .9       --       --       --
           30...       1200     38       8.4      8.3     2090     2080      8.0      5.0      580     99.0     80.0
         APR
           27...       1305     44        --       --       --     1340     17.0     13.8       --       --       --
         JUL
           05...       1145     11        --       --       --     1220     29.0     21.5       --       --       --
         AUG
           21...       1150     10       8.4      8.3     1960     1930     22.0     19.5      380     57.0     57.0


                                                                ANC                                        SOLIDS,
                           POTAS-   SODIUM                    UNFLTRD   CHLO-    FLUO-            SOLIDS,  RESIDUE
                            SIUM,     AD-   SODIUM,           TIT 4.5   RIDE,    RIDE,   SULFATE    DIS-   AT 180
                            DIS-    SORP-    DIS-               LAB     DIS-      DIS-    DIS-     SOLVED   DEG. C
                           SOLVED    TION   SOLVED             (MG/L    SOLVED   SOLVED   SOLVED   (TONS     DIS-
                  DATE     (MG/L    RATIO    (MG/L    SODIUM    AS      (MG/L    (MG/L    (MG/L     PER     SOLVED
                           AS K)             AS NA)  PERCENT   CACO3)   AS CL)   AS F)   AS SO4)    DAY)    (MG/L)
                          (00935)  (00931)  (00930)  (00932)  (90410)  (00940)  (00950)  (00945)  (70302)  (70300)

              OCT
                06...        --       --       --       --       --       --       --       --       --       --
              NOV
                15...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              FEB
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                13...        --       --       --       --       --       --       --       --       --       --
                30...      11.0       5       280      51       358     17.0       .3      850     160      1560
              APR
                27...        --       --       --       --       --       --       --       --       --       --
              JUL
                05...        --       --       --       --       --       --       --       --       --       --
              AUG
                21...      11.0       7       310      63       382     22.0       .5      630      36.7    1360


                          SOLIDS,
                          SUM OF                                        MANGA-            MOLYB-   SELE-    STRON-
                          CONSTI-  ARSENIC   IRON,    LEAD,   LITHIUM   NESE,   MERCURY   DENUM,   NIUM,     TIUM,
                          TUENTS,    DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-
                            DIS-    SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED
                  DATE     SOLVED   (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L
                           (MG/L)   AS AS)   AS FE)   AS PB)   AS LI)   AS MN)   AS HG)   AS MO)   AS SE)   AS SR)
                          (70301)  (01000)  (01046)  (01049)  (01130)  (01056)  (71890)  (01060)  (01145)  (01080)

              OCT
                06...        --       --       --       --       --       --       --       --       --       --
              NOV
                15...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              FEB
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                13...        --       --       --       --       --       --       --       --       --       --
                30...      1550     <1.0      60       <1      50.0      60        .4       1      <1.0     1400
              APR
                27...        --       --       --       --       --       --       --       --       --       --
              JUL
                05...        --       --       --       --       --       --       --       --       --       --
              AUG
                21...      1320     <1.0      50       <1      60.0      20       <.1       6      <1.0     1000

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